Standing Waves

A standing wave – also known as a stationary wave – is a wave that remains in a constant position.
It is the result of the interference of two waves of same amplitude, frequency and phase, going in opposite directions in the same medium.
There are some points of the medium that do not oscillate, called nodes.
There are some points of the medium that oscillate with maximum amplitude, called antinodes.

What is the distance between two consecutive nodes and antinodes?
What will happen if waves are of different amplitude?
What will happen if waves are of different frequency?